fix_timestamp

BaseViz:

   def get_json_data(self):
        return json.dumps([])

TableViz:
   def get_json_data(self):
        df = self.get_df()
        print("This is happening")
        return json.dumps(dict(records=df.to_dict(orient="records"),columns=list(df.columns),),default=utils.json_iso_dttm_ser,)

    def get_data(self):
        # This still needs to return json.loads
        self.get_json_data()